Need Beseler 45 Lensboard Plate/Assembly

I recently bought a used 45MXT that had been converted to a turret system. I have more than 3 lenses (and other Beseler enlargers) that I depend on for various duties and would prefer to simply swap lenses on their own boards. The seller did not have the lensboard plate and assembly that are listed as 10-49523 and 10-49522 in the parts list. Does anyone have an old parted-out rig that would supply these missing pieces?

Does anyone know what's up with Beseler? They don't answer emails and their website is certainly minimal in information, etc. I can imagine it isn't the best of times for them with solid used gear being almost given away, making the purchase of new gear less appealing as an option to ownership.